Heat exchange core and air duct



Jan. 27, 1948. D. w. CHRISTENSEN HEAT EXCHANGE CORE AND AIR DUCT Filed Sept. 25, 1943 2 Sheets-Sheet l jllllllll I2 /I mm INVENTDR. DONALD W C/m/smvsn/ BY v Arrow/Ev Jan. 27, 1948. D. w. CHRISTENSEN 2,434,988

HEAT EXCHANGE CORE AND AIR DUCT Filed Sept. 25, 1945 2 Sheets-Sheet 2 o 0 O Q O O o O o O O O O O O O O O -/7 flag /3 ALTO/211E) Patented Jan. 27, 1948 HEAT EXCHANGE CORE AND AIR'DUCT I Donald W. Christensen, Racine, Wis., assignor to Young Radiator Company, Racine, Wis., a corporation of Wisconsin Application September 25, 1943. Serial No. 503,848

The present invention relates to heat exchange cores or radiators and has for an object forming the headers preferably from prefabricated fiat sheet steel and securing the parts together by welding or brazing.

An important object of my invention generally stated is to provide a core which is light, strong, efficient and easily manufactured at low cost.

An object of the present invention is to provide a core having headers which can be conveniently connected to or in an air duct of simple and efficient design either for testing or for permanent equipment and wherein the duct is simple strong and efficient and can be manufactured at low cost, and wherein the duct and assembly has a pleasing appearance.

To these and other useful ends my invention consistsof parts and combination of parts or their equivalents, and mode of manufacturing and assembling as hereinafter described and claimed and shown in the accompanyingdrawings in which:

Fig. l is a front side elevational view of my improved core, one header being partially sectioned.

Fig. 2 is an edge view of the core as shown in Figur 1, one of the headers being sectioned on lines 2-2 of Figure 1.

Fig. 3 is a view of my device taken from one end of the complete device.

Fig. 4 is an end view of the core showing a, fraction of the air duct attached.

Fig. 5 is a top view partly in section of a short section of the air duct showing the core by dotted lines.

.Fig. 6 is a flat view of the main header member before being formed into a trough.

As'thus illustrated the core in its entirety is designated by reference character A, and B'designates the air duct in its entirety.

Core A comprises a bundle of tubes In having closely spaced fins I I through which the tubes extend. It will be understood that the core proper may be honeycomb type-or formed by means of tubes and fins wherein the tubes may be round fiat or tear drop in cross section.

The core is made complete by means of novel headers between which the tubes form operating-connections. The headers comprise a trough having tube plates l2 through which the tubes extend and are made taut and leak proof in any suitable manner. The header is formed by two flat sheets, preferably steel, the part from which the trough is formed is shown in Figure 6.

Tube plate I2 has side and end projections 3 Claims. (01. 257-137 l3-l3 and l t-i4 (see Figure 6) which are. after the part has been fabricated as shown in Figure 6, bentat right angles to member l2 as at 40 to form 'a' deep trough after which the adjacent edges ar welded or brazed together as at l5 (see Figure 4) Openingsl5 and II are preferably drilled or punched in members l2, l3 and It while the part is flat as shown in Figure 6. I

I provide a plate l8 which is drilled or punched as at N preferably near the end and having welded thereto as at 20 a short inlet. or outlet pipe 2| being preferably threaded as at 22, after which member i8 is inserted into the trough and welded thereto as at 23, thus a complete header is formed having a header chamber 24.

It will be seen that a complete core is provided having all steel headers, and that tubes l0 may be bonded to members I2 from either side beforeplates [8 are secured into place.

I provide a special air duct B comprising top and bottom plates 30-30 having spaced apertures for the reception of rivets or bolts and side plates 3l--3l having flanges 32 and spaced apertures .whereby plates 3| and flanges 32 may be secured together by means of rivets or bolts as at 34 and whereby the headers and members 301.

may be riveted or bolted together'as at '35 and the headers and flanges 32 ma be secured together as at 36.

It will be seen that an air tight duct is provided, the headers forming a part thereof, whereby the ducts may be detachably secured to the headers and the duct plates knocked down for shipment or storage.

Clearly I have provided very light and strong headers which may be made at low cost and that the assembly has a pleasing appearance.

I prefer to manufacture my improved header in the following manner: a flat sheet of steel is prefabricated as shown in Figure 6 after which the side and end members I3 and M are bent so as to form a trough. The adjacent edges of members l3 and I4 being then welded together. Tubes [0 may then be secured to tube plates l2 .in any suitable manner and after this operation plates l8 are placed into position in the trough and welded to the trough as already described.

It will be noted that they headers project inwardly past the sidewalls of the duct. In order to reduce air resistance plates 34 are provided and secured to theside plates. The inner ends rest- 7 ing on the corners of the headers as shown in Figure 5.

It will be seen that member A has a convenient shape for stacking or shipping in crates and that.

the entire device may be conveniently assembled or installed.

Having thus shown and described my invention I claim:

1. A heat exchanger of the class described, comprising spaced headers, a number of tubes forming operating tube connections between said headers and having a multiplicity of closely spaced fins through which the tubes extend, said headers being substantially rectangular in crossshape and comprising troughs through the bottoms of which said tubes extend and are bonded thereto, plates positioned in said troughs intermediate the bottoms and tops thereof and being bonded to the four inner walls of the trough and being positioned to thereby form a header closure and a supplemental trough, and inlet and outlet connections secured to said plates.

2. A heat exchanger of the class described, comprising spaced headers, a number of tubes forming operating connections between said headers and having a multiplicity of closely,

tween said plates and outer edges or the troughs, inlet and outlet air ducts secured to said headers comprising top. bottom and side plates, the side plates having flanges with spaced holes adapted to lie over said spaced openings, forming means for removably attaching the air ducts to the headers.

3. A device as recited in claim 2 including, said headers projecting inwardly into the sides of the duct formed by said plates, guide plates secured to said plates a distance from the headers and extending to the inner corners of the headers to thereby cooperate with the headers to form a venturi passageway.

- DONALD. W. CHRISTENSEN.

REFERENCES CITED UNITED STATES PATENTS 

